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Authors: Albini, P.* 
Strasser, F. O.* 
Flint, N. S.* 
Title: Earthquakes from 1820 to 1936 in Grahamstown and surroundings (Eastern Cape Province, South Africa)
Issue Date: 2014
Series/Report no.: 1/12 (2014)
DOI: 10.1007/s10518-013-9562-0
Keywords: historical seismicity; Eastern Cape Province, South Africa
Subject Classification04. Solid Earth::04.06. Seismology::04.06.05. Historical seismology 
Abstract: The seismicity of Grahamstown, in the Eastern Cape Province of South Africa, for the years between 1820 and 1936 is investigated with recourse to contemporaneous documentary sources, leading to the development of a seismic history incorporating consideration of the broader geo-political context. Individual studies of five regional events that were felt in Grahamstown during that period, and of one that was not, are presented. Each study includes the development of a full set of intensity data points (IDPs), which are used to determine reappraised epicentral locations and magnitudes, some of which differ significantly from previously listed parameters. The results thus obtained highlight the value of seeking out additional contemporary sources from different language groups when revisiting the source parameters of earthquakes for which no or only very limited instrumental information is available.
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